Question

我有一个表格中的条目列表，我试图在数据透视表查询中使用，如下所示。

SELECT *
FROM
(
SELECT [week_end], [identify_entity], [count_num]
FROM weekly_counts_t
) AS source
PIVOT
(
    MAX([count_num])
    FOR [identify_entity] IN ([a], [b] ...and so on)
) as pvt

下面的'for in'查询尝试使用来自其他表的select查询中的列表 FOR [identify_entity] IN (select identify_entity from temp_table)代替 FOR [identify_entity] IN ([a], [b] ...and so on)这是一个键入条目的手动过程。

所以现在，我需要将列表作为方括号中的条目并用逗号分隔。有人可以帮帮我吗？谢谢！

Answer 1

试试这个..

DECLARE @identify_entity  NVARCHAR(MAX);
SET @identify_entity = '';

SELECT @identify_entity = @identify_entity + ',[' + [identify_entity] + ']'
FROM (SELECT DISTINCT [identify_entity] FROM weekly_counts_t) t

SET @identify_entity = STUFF(@identify_entity, 1, 1,'')

DECLARE @Sql NVARCHAR(MAX);

SET @Sql = 'SELECT *
            FROM
            (
            SELECT [week_end], [identify_entity], [count_num]
            FROM weekly_counts_t
            ) AS source
            PIVOT
            (
                MAX([count_num])
                FOR [identify_entity] 
                IN ('+ @identify_entity  +')
            ) as pvt'
EXECUTE sp_executesql @Sql

方括号从select语句中包含逗号分隔列表

1 个答案: